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Liquid Handling

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https://www.readbyqxmd.com/read/29165984/on-chip-lipid-extraction-using-super-absorbent-polymers-for-mass-spectrometry
#1
Geul Bang, Young Hwan Kim, Junghyo Yoon, Yeong Jun Yu, Seok Chung, Jeong Ah Kim
Pre-treatment of samples is the one of most important steps in analytical methods for efficient and accurate results. Typically, an extraction method used for lipid analysis with mass spectrometry is accompanied by complex liquid-liquid extraction. We have devised a simple, rapid, and efficient lipid extraction method using super absorbent polymers (SAPs) and developed a high-throughput lipid extraction platform based on a microfluidic system. Since SAPs can rapidly absorb an aqueous solution from a raw sample and convert it into the gel, the lipid extraction process can be remarkably simplified...
November 22, 2017: Analytical Chemistry
https://www.readbyqxmd.com/read/29151676/jim-hyde-and-the-endor-connection-a-personal-account
#2
Klaus Möbius, Wolfgang Lubitz, Anton Savitsky
In this minireview, we report on our year-long EPR work, such as electron-nuclear double resonance (ENDOR), pulse electron double resonance (PELDOR) and ELDOR-detected NMR (EDNMR) at X-band and W-band microwave frequencies and magnetic fields. This report is dedicated to James S. Hyde and honors his pioneering contributions to the measurement of spin interactions in large (bio)molecules. From these interactions, detailed information is revealed on structure and dynamics of macromolecules embedded in liquid-solution or solid-state environments...
2017: Applied Magnetic Resonance
https://www.readbyqxmd.com/read/29149487/fabrication-of-chelate-setting-%C3%AE-tricalcium-phosphate-cement-using-sodium-citrate-and-sodium-alginate-as-mixing-solution-and-its-in-vivo-osteoconductivity
#3
Toshiisa Konishi, Poon Nian Lim, Michiyo Honda, Masaki Nagaya, Hiroshi Nagashima, Eng San Thian, Mamoru Aizawa
Moldable and injectable calcium-phosphate cements (CPCs) are material candidates for bone replacement applications. In the present study, we examined the effectiveness of sodium alginate and sodium citrate additives to the liquid phase of CPC, in improving its handling property as well as mechanical strength. The use of these additives enhanced the handling property significantly, in terms of consistency as compared to CPC without additives due to the liquefying effect caused by the adsorption of citrate ions on the cement particles...
November 17, 2017: Journal of Biomedical Materials Research. Part B, Applied Biomaterials
https://www.readbyqxmd.com/read/29146931/a-novel-magnet-actuated-droplet-manipulation-platform-using-a-floating-ferrofluid-film
#4
Chao Yang, Gang Li
In this paper, we propose a novel but versatile magnet-actuated platform for droplet manipulation, which uses a ferrofluid film floating on a liquid surface as magnetic actuator. In contrast to the traditional magnetic droplet manipulation, this platform can handle droplets without magnetically functionalizing them. Due to the immiscibility of the oil-based ferrofluid and water, the droplets desired to be manipulated can stably rest on the surface of the floating ferrofluid film (FFF) under the action of surface tension, thereby offering possibilities for magnetically-driven droplet manipulations...
November 16, 2017: Scientific Reports
https://www.readbyqxmd.com/read/29146304/extensive-evaluation-of-fastidious-anaerobic-bacteria-recovery-from-the-copan-eswab%C3%A2-transport-system
#5
Thomas Demuyser, Deborah De Geyter, Daisy Van Dorpe, Kristof Vandoorslaer, Ingrid Wybo
Anaerobic infections are difficult to diagnose and treat, because of the often slow in vitro growth, the polymicrobial nature and the increasing antimicrobial resistance. Furthermore because of their fastidiousness, anaerobic bacteria often stay unrecognized in clinical practice. Clinical specimens potentially harboring these species require special handling to permit satisfactory recovery of these potential important pathogens. In a clinical setting, temporary storage and transportation to the laboratory are unavoidable before these specimens can be cultured...
November 13, 2017: Journal of Microbiological Methods
https://www.readbyqxmd.com/read/29136289/extraction-of-amino-acids-from-aerogel-for-analysis-by-capillary-electrophoresis-implications-for-a-mission-concept-to-enceladus-plume
#6
Maria F Mora, Steve M Jones, Jessica Creamer, Peter A Willis
Ocean worlds like Europa and Enceladus in the outer solar system are prime targets in the search for life beyond Earth. Enceladus is particularly interesting due to the presence of a water plume ejecting from the south polar region. The recent discovery of H2 in the plume, in addition to the presence of previously observed organic compounds, highlights the possibility of life in this moon. The plume provides materials from the underlying ocean that could be collected simply by flying through it. The presence of the plume means that material from the ocean is available for collection during a flyby, without the need for landing or complex sample handling operations such as scooping or drilling...
November 14, 2017: Electrophoresis
https://www.readbyqxmd.com/read/29133419/supercooled-and-glassy-water-metastable-liquid-s-amorphous-solid-s-and-a-no-man-s-land
#7
Philip H Handle, Thomas Loerting, Francesco Sciortino
We review the recent research on supercooled and glassy water, focusing on the possible origins of its complex behavior. We stress the central role played by the strong directionality of the water-water interaction and by the competition between local energy, local entropy, and local density. In this context we discuss the phenomenon of polyamorphism (i.e., the existence of more than one disordered solid state), emphasizing both the role of the preparation protocols and the transformation between the different disordered ices...
November 13, 2017: Proceedings of the National Academy of Sciences of the United States of America
https://www.readbyqxmd.com/read/29131538/flexible-and-accessible-automated-operation-of-miniature-chromatography-columns-on-a-liquid-handling-station
#8
Spyridon Konstantinidis, Hai-Yuan Goh, José Mauricio Martin Bufájer, Paul de Galbert, Maria Parau, Ajoy Velayudhan
The High Throughput (HT) investigation of chromatographic separations is an important element of downstream bioprocess development due to the importance of chromatography as a technique for achieving stringent regulatory requirements on product purity. Various HT formats for chromatography exist, but the miniature column approach has characteristics resembling large scale packed bed column chromatography the most. The operation of such columns on robotic stations can be automated, but this is not always a straightforward procedure; the robotic manipulations are highly dependent on the settings of each experiment and the standard commands of the supporting software may not provide readily the required flexibility and accessibility for 'plug and play' functionality...
November 13, 2017: Biotechnology Journal
https://www.readbyqxmd.com/read/29116511/mass-spectrometry-immuno-assay-msia%C3%A2-streptavidin-disposable-automation-research-tips-d-a-r-t-s-%C3%A2-antibody-phage-display-biopanning
#9
Chai Fung Chin, Yee Siew Choong, Theam Soon Lim
Antibody phage display has been widely established as the method of choice to generate monoclonal antibodies with various efficacies post hybridoma technology. This technique is a popular method which takes precedence over ease of methodology, time- and cost-savings with comparable outcomes to conventional methods. Phage display technology manipulates the genome of M13 bacteriophage to display large diverse collection of antibodies that is capable of binding to various targets (nucleic acids, peptides, proteins, and carbohydrates)...
2018: Methods in Molecular Biology
https://www.readbyqxmd.com/read/29111652/ionic-liquid-mediated-dispersion-and-support-of-functional-molecules-on-cellulose-fibers-for-stimuli-responsive-chromic-paper-devices
#10
Hirotaka Koga, Masaya Nogi, Akira Isogai
Functional molecules play a significant role in the development of high-performance composite materials. Functional molecules should be well dispersed (ideally dissolved) and supported within an easy-to-handle substrate to take full advantage of their functionality and ensure easy handling. However, simultaneously achieving the dissolution and support of functional molecules remains a challenge. Herein, we propose the combination of a nonvolatile ionic liquid and an easy-to-handle cellulose paper substrate for achieving this goal...
November 13, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/29101903/contamination-with-explosives-in-analytical-laboratory-procedure
#11
Wojciech Pawłowski, Łukasz Matyjasek, Katarzyna Cieślak, Monika Karpińska
The philosophy underlying the procedure with the trace from the moment of the securing of the evidence up to its ultimate inspection is of significance for the result achieved. Hands of the people who conduct investigative action or of the experts involved in examinations contaminated with explosives may adversely affect results of the analyses. The contamination effect is one of the most dangerous consequences of non-observance of the strict rules in handling the traces secured on the crime scene. The aim of this research work was to examine whether at all, and if so, with what an ease and at which stage of the analytical procedure there occurs a likely contamination of the evidence material with explosives such as TNT, RDX, PETN, NG...
October 18, 2017: Forensic Science International
https://www.readbyqxmd.com/read/29092498/studying-the-field-induced-breakup-of-acoustically-levitated-drops
#12
C Warschat, J Riedel
Coulomb fission of charged droplets (The terms drop and droplet are often used synonymous. Throughout this manuscript, to avoid confusion, the terms drop and droplet will be used for liquid spheres with radii in the millimeter range and the micrometer range, respectively. In our experiments, the first correspond to the parent drop while the latter describes the ejected progeny droplets.) is a well-studied natural phenomenon. Controlled droplet fission is already successfully employed in several technological applications...
October 2017: Review of Scientific Instruments
https://www.readbyqxmd.com/read/29080828/effects-of-sulfur-fumigation-on-the-pharmacokinetics-metabolites-and-analgesic-activity-of-radix-paeoniae-alba
#13
Ming Kong, Huan-Huan Liu, Jie Wu, Ming-Qin Shen, Zhi-Gang Wang, Su-Min Duan, Yan-Bo Zhang, He Zhu, Song-Lin Li
ETHNOPHARMACOLOGICAL RELEVANCE: Radix Paeoniae Alba (Baishao, BS), one of the most commonly used traditional Chinese medicinal herbs, has many pharmacological effects including analgesic activity. Previous studies found that sulfur-fumigation, a post-harvest handling process developed to prevent mold contamination of medicinal herbs, altered the quality of BS. However, whether sulfur-fumigation affects the pharmacokinetics, safety and efficacy of BS warrants further investigation. AIM OF THE STUDY: To evaluate the feasibility of sulfur-fumigation as a post-harvest handling process of BS from the viewpoints of pharmacokinetics, safety and efficacy...
October 28, 2017: Journal of Ethnopharmacology
https://www.readbyqxmd.com/read/29058365/spheroids-formation-on-non-adhesive-surfaces-by-liquid-overlay-technique-considerations-and-practical-approaches
#14
REVIEW
Elisabete C Costa, Duarte de Melo-Diogo, André F Moreira, Marco P Carvalho, Ilídio J Correia
Scalable and reproducible production of 3D cellular spheroids is highly demanded, by pharmaceutical companies, for drug screening purposes during the pre-clinical evaluation phase. These 3D cellular constructs, unlike the monolayer culture of cells, can mimic different features of human tissues, including cellular organization, cell-cell and cell-extracellular matrix (ECM) interactions. Up to now, different techniques (scaffold-based and scaffold-free) have been used for spheroids formation, being the Liquid Overlay Technique (LOT) one of the most explored methodologies, due to its low cost and easy handling...
October 23, 2017: Biotechnology Journal
https://www.readbyqxmd.com/read/29056888/effect-of-garlic-supplement-in-the-management-of-type-2-diabetes-mellitus-t2dm-a-meta-analysis-of-randomized-controlled-trials
#15
Juan Wang, Xiuming Zhang, Haili Lan, Weijia Wang
The present study was designed to systematically evaluate the clinical efficacy and safety of garlic supplement in the management of type 2 diabetes mellitus (T2DM). PubMed, EMBASE, the Cochrane Library, and China National Knowledge Internet (CNKI) were searched for relevant randomized controlled trials (RCTs) by using the terms garlic and T2DM up to April 2017. The quality of included RCTs was assessed by the Cochrane tool of risk of bias, and data of outcomes were pooled by REVMAN 5.3. Clinical factors were handled by meta-regression and subgroup analysis, and risk of publication bias was explored by inverted funnel plots...
2017: Food & Nutrition Research
https://www.readbyqxmd.com/read/29054063/valorisation-of-tectona-grandis-tree-sawdust-through-the-production-of-high-activated-carbon-for-environment-applications
#16
Isabel Pestana da Paixão Cansado, Cristóvão Ramiro Belo, Paulo Alexandre Mira Mourão
This work presents a first approach concerning the use of Tectona Grandis tree sawdust (from East Timor) for high activated carbon production, by physical activation with carbon dioxide at different temperatures. The activated carbons (AC) obtained exhibit a well-developed porous structure with a pore size distribution varying from micro to mesopores. Selected AC was successfully evaluated for pesticide removal, specific to 4-chloro-2-methylphenoxyacetic acid, from the liquid phase. The results presented are very promising, allowing to establish that Tectona Grandis sawdust is as an excellent precursor for the basic AC production and allow to expect good performance of theses adsorbents on the removal of a broad range of pollutants...
October 10, 2017: Bioresource Technology
https://www.readbyqxmd.com/read/29053257/orthogonal-screening-of-anticancer-drugs-using-an-open-access-microfluidic-tissue-array-system
#17
Dongguo Lin, Peiwen Li, Jinqiong Lin, Bowen Shu, Weixin Wang, Qiong Zhang, Na Yang, Dayu Liu, Banglao Xu
Screening for potential drug combinations presents significant challenges to the current microfluidic cell culture systems, due to the requirement of flexibility in liquid handling. To overcome this limitation, we present here an open-access microfluidic tissue array system specifically designed for drug combination screening. The microfluidic chip features a key structure in which a nanoporous membrane is sandwiched by a cell culture chamber array layer and a corresponding media reservoir array layer. The microfluidic approach takes advantage of the characteristics of the nanoporous membrane: on one side, this membrane permits the flow of air but not liquid, thus acting as a flow-stop valve to enable automatic cell distribution; on the other side, it allows diffusion-based media exchange and thus mimics the endothelial layer...
October 31, 2017: Analytical Chemistry
https://www.readbyqxmd.com/read/29040278/pg-metrics-a-chemometric-based-approach-for-classifying-bacterial-peptidoglycan-data-sets-and-uncovering-their-subjacent-chemical-variability
#18
Keshav Kumar, Akbar Espaillat, Felipe Cava
Bacteria cells are protected from osmotic and environmental stresses by an exoskeleton-like polymeric structure called peptidoglycan (PG) or murein sacculus. This structure is fundamental for bacteria's viability and thus, the mechanisms underlying cell wall assembly and how it is modulated serve as targets for many of our most successful antibiotics. Therefore, it is now more important than ever to understand the genetics and structural chemistry of the bacterial cell walls in order to find new and effective methods of blocking it for the treatment of disease...
2017: PloS One
https://www.readbyqxmd.com/read/29036874/development-of-a-device-to-reduce-the-risk-of-injury-in-handling-unstable-loads
#19
Mohamed Zaki Ramadan, Mohammed Alkahtani
BACKGROUND: Manual material handling (MMH) task is the most common cause of work-related musculoskeletal disorders (MSDs). Operators carrying unstable loads were recently shown to be at greater risk of back injury compared to workers carrying stable loads. OBJECTIVE: This study focused on developing a device to minimize trunk muscle activity and cardiovascular demand while handling a 19-liter bottle. METHOD: After evaluating several designs, one was selected to be developed, manufactured and tested through an experimental study...
October 10, 2017: Work: a Journal of Prevention, Assessment, and Rehabilitation
https://www.readbyqxmd.com/read/29036359/profia-a-data-preprocessing-workflow-for-flow-injection-analysis-coupled-to-high-resolution-mass-spectrometry
#20
Alexis Delabrière, Ulli M Hohenester, Benoit Colsch, Christophe Junot, François Fenaille, Etienne A Thévenot
Motivation: Flow Injection Analysis coupled to High-Resolution Mass Spectrometry (FIA-HRMS) is a promising approach for high-throughput metabolomics. FIA-HRMS data, however, cannot be preprocessed with current software tools which rely on liquid chromatography separation, or handle low resolution data only. Results: We thus developed the proFIA package, which implements a suite of innovative algorithms to preprocess FIA-HRMS raw files, and generates the table of peak intensities...
July 14, 2017: Bioinformatics
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